P3 Energy resources

Exam-style questionsName...................................................................... Class................... Date......................

Figure 1 shows that the demand for electricity in a house varies during a summer day. Air conditioning is used in the house and cheap electricity is available at night for washing clothes and other appliances.

Figure 1

Suggest reasons for the increase in demand during the following times.

2100 –0100 hrs

(1 mark)

0700–0900 hrs

(1 mark)

1800–2000 hrs

(1 mark)

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P3 Energy resources

Exam-style questionsName...................................................................... Class................... Date......................

Table 1 shows the start-up times for different types of power stations.

Type of power station Start-up time in hoursnuclear 48.0

gas 0.5

coal 24.0

oil 1.5

Table 1

The base load is the constant power supplied throughout the day.

Suggest one type of power station that can be used for the base load.

(1 mark)

Suggest one type of power station that can be used when demand increases.

(1 mark)

Hydroelectric pumped storage systems can also be used to supply energy when the demand increases.

Give two advantages of using a hydroelectric system rather than an oil fired system.

(2 marks)

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P3 Energy resources

Exam-style questionsName...................................................................... Class................... Date......................

Table 2 shows the power produced by the wind farm during one day, during which the wind speed varies as shown.

Wind speed in m/s Power in Watts3 0

6 3800

9 7600

12 13 600

Table 2

A student concludes that the power produced is directly proportional to the wind speed.

Do you agree with the conclusion – Yes or No? Give reasons for your answer.

(2 marks)

Suggest one reason why there is no power generated when the wind speed is 3 m/s.

(1 mark)

The wind farm consists of 8 wind turbines.

Calculate the mean power produced by one wind turbine in the wind farm during this day.

Mean of 1 wind turbine: W (2 marks)

The wind farm is used to power machinery and lights in a factory in a remote hilly area.

Give one advantage and one disadvantage of using solar panels as a back-up energy resource.

(2 marks)

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P3 Energy resources

Exam-style questionsName...................................................................... Class................... Date......................

A farmer plans to generate all the electricity needed on her farm, using either a biogas generator or a small wind turbine.

The biogas generator would burn methane gas. The methane gas would come from rotting the animal waste produced on the farm. When burnt, methane produces carbon dioxide.

The biogas generator would cost £18 000 to buy and install. The wind turbine would cost £25 000 to buy and install.

The average power output from the wind turbine would be the same as the continuous output from the biogas generator.

Evaluate the advantages and disadvantages of the two methods of generating electricity.

Conclude, with a reason, which system would be better for the farmer to buy and install.

(6 marks)

A student investigates how the amount of light received by a solar cell affects the output voltage of the solar cell.

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P3 Energy resources

Exam-style questionsName...................................................................... Class................... Date......................

The distance from the light source to the solar cell is a control variable.

Identify two other control variables.

(1 mark)

Suggest one way of changing the intensity of light used during the investigation.

(1 mark)

The results from the investigation are given in Table 3.

Intensity of light in lumens

Output voltage in mV

150 33

200 45

250 56

300 82

350 80

Table 3

Identify the anomalous result in the results. Suggest a possible reason for the anomaly.

(2 marks)

A student suggests that a solar panel will have a bigger output if it is situated on the roof of a tall building rather than in the garden.

Is the student correct? Explain your answer.

(2 marks)

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P3 Energy resources

Exam-style questionsName...................................................................... Class................... Date......................

Nuclear power stations are being built to replace coal fired power stations.

Give two advantages of using nuclear power to supply energy rather than coal.

(2 marks)

Explain what is meant by the term carbon capture and storage (CCS).

(2 marks)

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